Speaking of Kalanchoe...

Thank you for the ideas, Carl and David.
David, I looked at the 1990 ABT paper. It looks very simple and
straightforward. I wonder if students could do a comparison of pH
measurements on CAM, C4, and C3 leaves. Presumably theC4s acidify in
light and the C3s change little?
Anyone tried it or know about this?
Jon
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